Slideway grinding machine



Jan. 20, 1959 o. BRETscHER Y 2,869,288

SLIDEWAY GRINDING MACHINE Filed M arch 17, 1955 2 Sheets-Sheet 1 Fig/46 46 Jan. 20, 1959 o. BRETscHER 2,869,288

sLIDEwAY GRINbING MACHINE Filed March 1v, `1955 2 sheets-sheet 2 United States Patent 2,869,2ss y s'LmnwAr GRINDING MACHINE Otto Bretscher, Gerlafingen, Switzerland, assignor to Gesellschaft der Ludw. von Rollschen Eisenwerke A. G., Gerlalingen, Switzerland, a Swiss company Application March 17, 1955, Serial No. 494,835 Claims priority, application Switzerland March 20, 1954 4 claims. (ci. s13) The present invention relates to a slideway grinding machine, particularly for grinding the slideways of the beds of lathes, planing machines, millers and grinders.

To render work of this nature less expensive, grinding machines have already been designed in which two grinding attachments are provided which are displaceable along the cross ways of the grinding machine so that at least two slideways can be machined simultaneously, irrespective of whether the sliding surfaces are at or profiled. The beds of the abovementioned machine tool-s are as a rule -provided with undergrip guides to secure the carriage moved along the slideways, which guides must 'be rice tend horizontally and transversely with respect to said table, said crossways being mounted at one lor both of itsends in vertical columns (not shown in the drawing), said crossways carrying two grinding wheels y45 by means of a slide 46 each.

On the lower surface of the cross ways or support l1, at the front of which guideways 2 are -arranged for the grinding wheel slides 46, therev is provided a recess or groove 3 with guideways 4 and 5 (Fig. 3). The supporting slide 6 is mounted in these guideways so that it can be displaced horizont-ally, and it is provided with a screwed-on threaded nut 7 through which the threaded ground from underneath lby means of dish grinding permits carrying out of a wide varietyof grinding operations at utm-ostprecision. 4 d

It is another object of the invention to provide means atfording a highly economical performance of grinding operations simultaneously on upper and lower surfaces of a workpiece, whereby the superpositioned planes in which grinding is carried out, may overlap or stagger with respect to each other.

The ,purpose of the present invention is further to enable undcrgrinding to be carried out on a workpiece at ithe same time as the grinding of the top surface thereof is performed.

The invention more precisely contemplates the provision of cross rails or cross ways in grinding machines not only 'with gui-deways for the grinding wheel slide but also additional guideways in which at least one supporting slide with a vertically adjustable undergrindi-ng attachment is mounted s-o that it can be displaced horizontally.

A typical embodiment of the invention is illustrated in th-e attached drawings in which:

Fig. l is a fragmentary front view of a slideway grinding machine with -a workpiece chucked in position Iand two undergrinding attachments arranged on the cross ways of 'the machine;

Fig. 2 is a similiar view on an enlarged scale of an undergrinding attachment seen in conjunction with the cross ways of the machine;

Fig. 3 is a cross-section taken .along the line III-JH in Fig. 2;

Fig. 4 is a top plan view of the attachment according to Fig. 2; and

Fig. 5 is a cross-section taken along line V-V in lFig. 2, the grinding spindle being axially adjustable in the vertical slid-e.

As will be seen from Fig. l of the drawing, the slideway grin-ding machine incorporating the present invention comprises a workpiece table generally indicated at 41 and having a table base 42 and Ia slidable top 43, the latter carrying a workpiece 44.

Above the workpiece table 41 and the workpiece 44 a crossways or supporting member 1 is disposed to exguide spindle 8 passes. This supporting slide s provided with clamping bolts 12 and 13 which are hydraulically controlled by means of the handwheel 10. As is conventionally known, the `spindle 8 is supported -or rotation Iand against axial displacement in suitable bearings (not shown) located, for example, ladjacent the opposite ends of the spindle. IEither a handwheel or a constantspeed, generally reversible motor (not shown) may Ibe drivingly connected to the spindle by any suitable means for the purpose of rotating said spindle. The slide 6 can thus be displaced horizontally 'by rotating the threaded spindle 8 mounted in the cross ways, independently of the grinding wheel slides 46 mounted in the aforesaid guideways 2. `In the supporting slide 6 there is arranged,` by way -of example, a vertical dovet-ail guide 6a on which a vertical slide 14 is mounted.

Bolted to the slide 6 by means of bolts 15a is a ange u 15 (Figs. 2 and 3) to which an internally threaded tube 16 is rigidly welded at right angles. The threaded spindle 17, which is mounted on ball bearings 18 and 19 in the housing 14a, engages in this internally threaded tube. On its lower end the spindle 17 has a handwheel 20, by. means of which the spindle 17 can be rotated and the slide 14 roughly adjusted. Between the two ball bearings 18 and 19 a worm gear 21 is keyed on to the spindle 17. This gear is engaged by the line adjusting worm 22 which is mounted on the shaft 22a and on which is arranged the handwheel 23, by means of which the slide 14 can be vertically adjusted during the line infeed. The shaft 22a, on which the ne adjusting worm 22 is arranged, is eccentrically mounted in a rotatable bushing 22h and can be turned by means of the lever 22o so that the worm 22 can be disengaged from the Worm gear 21 if a coarse feed has to be set. For the tine adjustment of the grinding wheel 29, the latter can also be mounted in a threaded bushing so that,lby turning said threaded bushing or a threaded nut associated therewith, the said wheel can be finely adjusted without displacing the slide 14. Fig. 5 shows this adjusting device. The grindingy spindle 27 can, as shown in Fig. 5, be mounted in an axially shiftable bushing 35 in the vertical slide. The said bushing 35 is provided with a thread 36 and held in a threaded nut 37 so that it is axially displaceable. The bushing 35 also has a toothed rim 38 which is engaged by the worm 39 mounted on the shaft 40. Coarse adjustment of the grinding wheel can be effected by turning the shaft 40 with the nut 37 locked, and tine adjustment by turning the nut 37. The vertical slide 14 has an arm-supported bearing 25 in which is mounted the bearing bushing 26 of the grinding spindle 27. Arranged on the grinding spindle 27 is the belt pulley 28 which engages in the groove 3 of the crossways 1, which groove opens in downward direction. Also mounted on the said spindle is a grinding wheel 29, of the dish type for instance. Secured to the grinding head 25-26-27-146 via arms 30 on the other side of the vertical slide 14 is a power driven means in the form of amotor 31, the belt pulley 32 of which also engages in the groove 3 of the cross-rail or support 1 and drives the belt pulley 28 of the grinding spindle 27 via the belt 33. The grinding wheel 29 can therefore be adjusted both horizontally and vertically by means of the threaded spindle 8 of the cross ways 1 and the threaded spindle 17 in the vertical slide rest 14, respectively.

Various changes and modications may be made without departing from the spirit and scope of the present invention and it is intended that such obvious changes and modifications be embraced by the annexed claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

l. In a slideway grinding machine having rst and second grinding means for simultaneously grinding both upper and lower surfaces of a workpiece and equipped with a workpiece table movable relative to said grinding means; Va horizontal support means extending above and across said workpiece table, first and second guideways provided on said support means and arranged in planes forming an angle to each other, means for slidably supporting said rst grinding means along said rst guideways, power driven means in driving connection with said second grinding means, said second guideways being located on the underface of said support means, horizontally movable slide means extending into said second guideways and supporting said power driven means, vertical slide means displaceably arranged on said horizontally movable slide means, said power driven means and said second grinding means being operatively connected with and displaceable by said vertical slide means relative to said horizontally movable slide means, means for actuating said vertical slide means, and means for operating asaid horizontally movable slide means independently of 1, including bearing means, spindle means for said second grinding means and supported in said bearing means, said power driven means, said second grinding means and said horizontally movable slide means together with said vertical slide means being arranged as a unit for displacement relative to said first grinding means, said means for operating said vertical slide means being disposed intermediate said power driven means and said second grinding means.

3. In a slideway grinding machine according to claim 2, said bearing means of said second grinding means including externally threaded bushing means mounted for rotation on said vertical slide means, and internally threaded nut means in operative engagement with said externally threaded bushing means, whereby said second grinding means may be finely displaced in vertical direction upon rotational movement of said but-hing means relative to said nut means and independently of the vertical adjustment of said second grinding means by said vertical slide means.

4. In a slideway grinding machine according to claim l, said power driven means including motor means, and belt and pulley means drivingly connecting said motor means with said second grinding means, said horizontal support means being provided with a groove accommodating said belt and pulley means.

References Cited in the le of this patent UNITED STATES PATENTS 2,363,039 Baldenhofer Nov. 21, 1944 2,524,332 Sichel Oct. 3, 1950 FOREIGN PATENTS 864,368 Germany Jan. 26, 1953 1,068,007 France f Feb. 3, 1954 A u "A 

